I like them quite a bit so long as I'm not wearing a tie. Then it's back to a single button.
As far as pushing it, last time I was at NM they had a Turnbull & Asser shirt with triple button cuffs " clearance priced " @ $165.

We sell a few shirts every season with a double button collar and double button cuff. The collar stance on these shirts are alittle higher and we choose fabrics that have interesting expression to them, mostly tattersalls,
ginghams and fancies. With the interest to wear suits and sports jackets again to work, we have promoted this affectation to replace the tie which still hasn't found favor to those who have not worn one in awhile.

A double-button collar serves two functions. First, it helps prevent the collar band from rolling over on higher-collar shirts. Second, the second collar button prevents the first from acting as a pivot point, which ensures that the tie space will not vary depending on how tight you tie your tie or your posture at any given moment.